import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login.vue'
import Home from '../components/Home.vue'

Vue.use(VueRouter)

const routes = []

const router = new VueRouter({
  routes: [
    {
      path: '/',
      redirect: '/login'
    },
    {
      path: '/login',
      component: Login
    }, {
      path: '/home',
      component: Home
    }]
})

//挂载路由导航守卫
//to是我们跳转的路径，from是来自的路径，next为放行函数
router.beforeEach((to, from, next) => {
  //如果用户访问登录页，直接放行
  if (to.path === "/login") return next();
  //从sessionStorage中获取到保存的token值
  const tokenStr = window.sessionStorage.getItem("token");
  //没有token，强制跳转到登录页面
  if (!tokenStr) return next("/login");
  next();//有token，直接放行
})


export default router